Page 423 - IRSEM_Main Book

Section 10: Maintenance of Block Proving by Axle Counter

18.10.1 Block Proving by Axle Counter using UFSBI Block Panel

(a) Various parameters of Axle Counter track equipment and UFSBI shall be
maintained within permissible values as per the instructions issued from
time to time and as per the OEM manuals.

(b) It shall be ensured that various signal levels at prescribed points of electronic
equipment are within permissible limits as per laid down instructions.

Section 11: Maintenance of Embedded type Block Working

18.11.1 Block Working Built into Electronic Interlocking

(a) Maintenance and parameter of Embedded type Block working shall be
maintained as per maintenance schedule of Electronic Interlocking and
Video Display Unit (VDU) maintenance schedule issued from OEM
maintenance manual.

(b) It shall also be ensured that all equipment connected with EI related with
Block working shall work as per laid down instructions

Section 12: Intermediate Block Signalling (IBS)

18.12.1 General Requirements

(a) IBS is an arrangement made for increasing the section capacity by splitting
of a relatively a long block section into two portions namely rear section
and advance section by placement of IBS at the point of near bifurcation,
subject to other considerations, such as presence of steeper gradients on
approach of the IBS, neutral section, visibility of signals etc. If required, up
& down IBS may be staggered to suit the local condition.

(b) The rear section i.e. "station controlled intermediate block section" starts
from LSS of the rear station and ends at IBS including 400 meters block
overlap in that direction.

(c) Advance section i.e. "block controlled Intermediate Block section “starts
from IBS and ends at home signal of advance station including block
overlap in that direction.

(d) Track sections both in Rear section i.e. "station controlled intermediate
block section" & Advance sections i.e. “block controlled Intermediate Block
section” are monitored either by Axle Counter or by Track circuit.

(e) Train entry into rear section i.e. "station controlled intermediate block section"
is controlled by LSS of rear station in that direction.

(f) Train entry into advance section i.e. “block controlled Intermediate Block
section” is controlled by IBS in that direction.

Chapter 18: Block Instruments, BPAC & IBS Working Page 371 of 535